21221212120012 has 12 divisors (see below), whose sum is σ = 37607211352480. Its totient is φ = 10476294590736.

The previous prime is 21221212120001. The next prime is 21221212120021. The reversal of 21221212120012 is 21002121212212.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33577866963 + ... + 33577867594.

Almost surely, 2^{21221212120012} is an apocalyptic number.

It is an amenable number.

21221212120012 is a deficient number, since it is larger than the sum of its proper divisors (16385999232468).

21221212120012 is a wasteful number, since it uses less digits than its factorization.

21221212120012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67155734640 (or 67155734638 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21221212120012 its reverse (21002121212212), we get a palindrome (42223333332224).

The spelling of 21221212120012 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred twelve million, one hundred twenty thousand, twelve".